21010121222 has 8 divisors (see below), whose sum is σ = 31515998400. Its totient is φ = 10504788424.

The previous prime is 21010121183. The next prime is 21010121227. The reversal of 21010121222 is 22212101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21010121197 and 21010121206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010121227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19697 + ... + 205932.

It is an arithmetic number, because the mean of its divisors is an integer number (3939499800).

Almost surely, 2^21010121222 is an apocalyptic number.

21010121222 is a deficient number, since it is larger than the sum of its proper divisors (10505877178).

21010121222 is a wasteful number, since it uses less digits than its factorization.

21010121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272190.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21010121222 its reverse (22212101012), we get a palindrome (43222222234).

The spelling of 21010121222 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, two hundred twenty-two".